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High load factor indicates total plant capacity is utilised for most of the time.

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Answer :

A low utilization factor for a plant indicates that plant is used for stand by purpose.

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A load curve indicates average kWh (kW) energy consumption during the period.

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Answer :

An induction motor has relatively high power factor at near full load.

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For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

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Description :

In order to have a lower cost of electrical energy generation the load factor  (1) and the diversity factor should be low (2) should be low but the diversity factor should be high (3) should be high but the diversity factor should be low (4) and the diversity factor both should be high

Answer :

In order to have a lower cost of electrical energy generation the load factor and the diversity factor both should be high

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Answer :

Peak load plant can never have 100 percent load factor.

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In two part tariff, variation in load factor will affect operating or running charges.

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The load factor of domestic load is usually 10 to 15%.

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Load factor of a power station is generally less than unity.

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Load factor of a power station is defined as average load/maximum demand.

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Power factor of the system is kept high?

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Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.

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Description :

What is the advantage of high power factor?

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Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

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Description :

Load factor is the  (1) Ratio of maximum load on the station to sum of consumer's maximum load.  (2) Ratio of average demand to maximum demand.  (3) Factor used for increasing load.  (4) Reciprocal of (1).

Answer :

Load factor is the Ratio of average demand to maximum demand. 

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Description :

A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

Answer :

Leading

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Description :

The load duration curve for unity load factor will be of  (1) Rectangular shape (2) Triangular shape (3) L -shape (4) I -shape

Answer :

The load duration curve for unity load factor will be of Rectangular shape

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Description :

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is  (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh

Answer :

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh

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Description :

In a synchronous generator delivering lagging power factor load  (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) excitation emf leads the terminal voltage by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle

Answer :

In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle

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Answer :

The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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Description :

Minimum voltage regulation occurs when the power factor of the load is?

Answer :

Minimum voltage regulation occurs when the power factor of the load is leading.

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Description :

If the load of the normally excited synchronous motor is increased the power factor will?

Answer :

If the load of the normally excited synchronous motor is increased the power factor will become lagging.

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Description :

The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

Answer :

The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

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Answer :

Depreciation charges are high in case of thermal plant.

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Description :

The following formula is correct:  (A) Load factor=Average load for a period/ Peak load for the same period  (B) Load factor=Average load for a period x Peak load for the same period  (C) Load factor=Average load for a period + Peak load for the same period  (D) All of the above

Answer :

The following formula is correct: (A) Load factor=Average load for a period/ Peak load for the same period (B) Load factor=Average load for a period x Peak load for the same period (C) Load factor=Average load for a period + Peak load for the same period (D) All of the above

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Answer :

In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

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For a consumer the most economical power factor is generally 0.95 lagging .

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In an interconnected system, the diversity factor of the whole system increases.

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Answer :

The primary reason for low power factor is supply system is due to installation of induction motors.

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Answer :

Power plant having maximum demand more than the installed rated capacity will have utilisation factor more than unity.

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Answer :

Diversity factor has direct effect on the fixed cost of unit generated.

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Answer :

Demand factor is defined as maximum demand/connected load.

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Description :

Can a synchronous condenser improve power factor?

Answer :

Yes, synchronous condenser can improve power factor.

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Description :

What is the maximum value of power factor?

Answer :

1 is the maximum value of power factor.

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Description :

Compare base load plant with peak load plant. 

Answer :

Sr.No. Points Base load plant Peak load plant  1 Definition The power plant which supplies base load of load curve is known as base load plant The power ... power station   Small capacity storage hydro, pumped storage hydro, gas, diesel power station. 

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Description :

Answer :

1. Connected Load: It is the sum of load of all equipment's connected to supply system which are in use or not in use of each consumer. OR   The sum of connected load of all consumers ... is the maximum load which a consumer uses at a particular time period out of his total connected load. 

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Answer :

Nuclear power plant is invariably used as base load plant.

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Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

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In a load curve the highest point represents peak demand.

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Generating capacity connected to the bus bars and ready to take load when switched on is known as spinning reserve.

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The increased load during summer months is due to increased use of fans and air conditioners.

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Answer :

Load curve is useful in deciding the operating schedule of generating units, sizes of generating units, total installed capacity of the plant.

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Answer :

The area under a load curve gives energy consumed.

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Sparking occurs when a load is switched off because the circuit has high?

Answer :

Sparking occurs when a load is switched off because the circuit has high inductance.

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Answer :

The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.

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Description :

State the advantages of use of high voltage in transmission of Electric power. 

Answer :

Advantages: 1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases, its ... high voltage transmission line, successful interconnection of transmission line is possible than low voltage. 

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Description :

Limitation and application of High Voltage DC (HVDC)

Answer :

Limitation and application of High Voltage DC (HVDC) :  Limitation:- 1) It is difficult to step up and step down DC voltage like AC voltage. 2) Special cooling ... conventional/non-conventional) 12) Increasing existing grid utilization. 13) Interconnection of different grids or networks

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Description :

Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

Answer :

Methods for measurement of low resistance:  1. Ammeter voltmeter method  2. Kelvin's bridge method  3. Ohm meter method  4. Potentiometer method  5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible.  2. Connection errors.

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Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer :

Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

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Description :

Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 

Answer :

Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 

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Description :

Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Answer :

Step-down transformer converts high voltage and low current into: Low voltage and high current

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The number of cycles in which a high speed circuit breaker can complete its operation is  (A) 3 to 8 (B) 10 to 18 (C) 20 to 30 (D) 40 to 50

Answer :

The number of cycles in which a high speed circuit breaker can complete its operation is 3 to 8

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